A new genus, Oehlia with Oehlia diaphana comb. nov and an emended description of Rhizoglomus vesiculiferum comb. nov in the Glomeromycotina

Morphological comparisons of spores and phylogenetic analyses of sequences of the SSU-ITS-LSU nrDNA region and the RPB1 gene indicated that an arbuscular mycorrhizal fungus (AMF) originally described as Glomus diaphanum and two Canadian AMF, DAOM745424 and DAOM227022, are conspecific and represent a separate Glade at the rank of genus in the subphylum Glomeromycotina. The genus was here erected under the name Oehlia and morphological and molecular descriptions of its type species, O. diaphana comb. nov., were presented. The analyses also proved that the strain originally identified as G. diaphanuni MUCL 43196 (DAOM229456) in fact is Rhizoglomus irregulare. In addition, the morphology and molecular phylogeny of an AMF originally named Endogone vesiculifera were revised based on spore clusters grown in culture. The revision indicated that the morphological description of the species is incomplete. It also confirmed that the fungus is a member of the genus Rhizoglomus and for the first time showed that the closest morphological and molecular relative of Rh. vesiculiferum comb. nov. is Rh. irregulare.